Roll changing apparatus



June 22, 1965 M. P. SIEGER ETAL 3,190,099

ROLL CHANGING APPARATUS Filed Sept. 28, 1962 v 5 Sheets-Sheet 1 H2 77 ii Ill Fr] A .:]l lH'i.

| L1! 1;! II I4 /2' 111 FIG.I j

INVENTOR.

MAURICE P; SIEGER JAMES AADAIR BY v THE/F! TTORNEY June 22, 1965 M. P. SIEGER ETAL 3,190,099

ROLL CHANGING APPARATUS 5 Sheets-Sheet 2 Filed Sept. 28. 1962 .R N 91 m A Y N II E 3 1% m m m 0 P T EA. QM m m m m 8 mm 8 MMU B n. IIEM la .1. ONALS 8 AN 8 u m I lit. .I||.. N W l ..m. h wk 8 8 If 8 5 8 .U 1

June 22, 1965 M. P. SIEGER ETAL 3,190,099

ROLL CHANGING APPARATUS Filed Sept. 28, 1962 5 Sheets-Sheet 3 FIG. 3

INVENTOR. MAURICE R SIE'GER JAMES A.ADA|R THE I R ATTORNEY June 22, 1965 M. P. SIEGER ETAL 3,190,099

ROLL CHANGING APPARATUS 7 Filed Sept. 28. 1962 5 Sheets-Sheet 4 INVENTOR.

MAURICEF? SIEGER E JAMES A. ADAIR THE IR A TTORNE Y June 22, 1965 M. P. SIEGER ETAL 3,190,099

- ROLL CHANGING APPARATUS Filed Sept. 28; 1962 s Sheets-Sheet s INVENTOR. MAURICE F. SIEGER JAMES A. ADAIR THE! ATi'ORNEY stantial distance, to and from the'rnill.

United. StatesPatent O This invention relates to a roll changing apparatus for use in connection with a rolling mill and while it may be employed with many difierent types of such mills, it is particularly applicable for use in conjunction with rolling mills for producing beams, structural members and the like: e V

Present-day millsemployed for producing such products and, particularly, universalrmills, may be Conveniently classified relative to the system employed for changing the. rolls of the mills, i.e., as those in which the entire mill is merit includetandemly'arranged stands, such as universal and edger stands employed inrolling beams, then in that v event the 'present invention provides an apparatus'for simultaneously changing the rolls of the number of mills at substantially no loss inproductiontime over what is experienced in changing the rolls of only one stand.

Furthermore, roll changing in accordance with the present invention does not require the employment of one or more cranes during the actual roll changing procedure, and has the additionaljadvantage of permitting new roll assemblies to be brought to the mill and stored prior to the discontinuance of the operation thereof and the worn roll assemblies to be removedat a convenient time I after the mill has been placed back inoperation. Since the crane is not needed during the actual roll changing operation, it will be available for'maintenance Work that would otherwise have to be held in abeyance, thusexremoved from its operative position and those in which only the rolls thereof are removed and the millitself remains in its operative position.

In changingthe rolls of a mill that fall within. the first classification, the entire mill, including the rolls but excluding the drive thereof, is lifted bodily from its operative position and replaced by a second mill. This'second mill is sometimes referred to as a setup mill and includes a new set of rolls. While in'employing this system of roll changing lost time'is kept to a minimum, it obvithe way of additional setup mills and providing 'a crane or cranes of 'sufiicient capacity to handle the massive mills. As a result, this system has limited application.

To avoid such extravagant capital expense, many mill users employ mills that fall Within the second classification, wherein the mill is not removable-from its operative position, but the rolls thereof are changed'by use of a roll carrying device, such as a C hook, porter bar'or sling assembly. In certain types of these mills, the housings thereof must also be spread apart prior to the removal of the rolls. In this system the rolls must; be individually removed and replaced, which, of course, entails an attendant appreciable loss in production time and in the need'of the services of a crane or cranes for an appreciable period of time. r

This loss in productiontime is even greater in those cases where the cranes must carry the rolls 'any sub- In addition to these losses in time, there are many other losses incident to the employment of C hooks, etc., such as the time necessary to lock the chocks from turning during their movement through the mill and in axially adjusting the rolls and guides oncethe rolls are inserted into the mill.

Another disadvantage in the system employing a C hook, etc., isthat in most instances the roll necks of tending even further the losses in production time.

According to the present invention as employed, for example in conjunction with a universal beam mill,.an apparatus is provided including a rig for each horizontal roll. Each of these rigsis constructed to receive and support ailrst and second roll assembly, in which connection means are provided for retracting from and in ser'ting into the mill roll assemblies. Additional means are provided to move the rigs relative to the mill so that 'ously entails an extremely large capital outlay, both in I.

when the rigs are moved, the first roll assemblies willbe moved away from the mill and the second roll assemblies will be automatically positioned relative to the mill in readiness for insertion therein. a

The preferred form of the present invention also includes superimposed structures which are'arranged at the operating side of and designed to extend beyond the mill. The upper structure provided for the rig that services the' upper roll extends across the housing projection provided for one of the vertical rolls of the mill. These structures are arranged at such elevations relative to the horizontal rolls that the rigs carried thereon, when positioned in front of the mill, will present surfaces that willesupport and guide the roll assemblies during their retraction and insertion without necessitating any manipulation of the rolls during their movement inran axial direction. In some forms, the mill itself may be prothe horizontal rolls must be madelonger than necessary in order that the C hooks, etc. can engage the ends of the rolls. In addition to this disadvantage, this lengthening V of the rolls prevents ease in adjusting the rolls'axially relative to each other. 7

The present invention provides an apparatus for chang- 7 ing the rolls of a mill and is particularly adapted for use in conjunction with a universal typernill, having the significant advantages over prior procedure of roll changing men it considerably reduces the'production time losses incident to this operation, thearnount of UIHE, a crane or cranes are required, and allowsa more simply contive position in f order to change its rolls. 7 V V In addition to these advantages, should the mill arrangevided with means for supporting and guiding the-roll assemblies during the initial period of the roll changing procedure, in whichcase the supporting and guiding surfaces of the rigs will cooperate with the supporting surfaces of the milli The preferred form of the invention also provides, in

connection with the rig provided for the upper roll, two carriages, one designed to retract a first or worn roll assentbly andthe other arranged adjacent to the first, but designedxto insert a second 'or replacement roll assembly.

Common means is provided for moving both carriages in unison to their respective operative positions.

The rig for the lower roll, because of the particular construction characteristic of the mill in this location, can be made of a simpler construction than the-one provided for the upper roll and in this case, no carriages are provided, but instead the rig is constructed with tworoll receiving platforms for supporting the two roll assemblies. A means is provided for moving this rig and, hence, the platforms into their respective operative positions.

ing into the mill the roll assemblies.

which removable floor plates'may be placed whenzthe rig is not being usedf In the case of the rigprovidedfor the upper roll assembly, its supporting structure is made to extend away from the mill which allows the rig to becon- Pater ted June 22, 1965 V I In addition, a common means is provided for retracting from and insert These various features and advantages, as well as others,

I will be more apparent from the following description when read in Conjunction with the accompanying drawings of which: m

FIGURE .1 is a top plane view of a universal and edger mill'arrangement, partially in'section, and of roll changing apparatus incorporating thefeatures of the present invention which is employed in conjunction with the 'mills;

FIGURE 2 is a sectional view, taken on lines 11- 1 of FIGURE lot the universal mill and itsyroll changing apparatus; i I 7 FIGURE 3 is a sectional view taken on lines III'III of FIGURE 1 of the edger mill and its roll changing apparatus; a

FIGURE 4 is'a sectional view from the operating side of the mill arrangement taken on lines IV"IV.of FIG- URE 2;. i

FIGURES 5 and 6 are enlarged'partial elevation views of certain of the componentsrof the'universal mill taken at lines V'V and VIVI,' respectively of FIGURE'Z';

operations.

1 22 of the chocks and serves to support and guide the roll; assembly 17' during boththe rolling and roll "changing It is a feature'jjof the employment of the beams 25 and'26 to make possible the employment of rollsiof the shortest possiblelength for a given beamsize to be produced,.whichafeature is'disclosed in a copending US. application of Maurice P. Siege'r'Serial No.-146,580

filed onvOctober 20; 1961 entitled Beam andPlaterMill.

' It will be noted that the ends of the rollsil6 and 170m FIGURE 7'is a partial sectional fview taken on lines VII-'VII of FIGURE 1; 7

FIGURE 8 is a partial sectional view taken on lines VIII'VIII of FIGURE 2; and

FIGURE 9 is a partial elevational view taken onlines -IX D( 0f FIGURE 1.

With reference to 'these drawings there is illustrateda mill designed to roll wide 'fiange beams comprising a roughing universal mill 11 and an adjacently arranged. edger mill 12.

It is deemed unnecessary foran understanding of the present invention'to explain in detail the various components of these mills, although reference will be made to certain significant elements thereof.

Universal. mill The universal mill 11 includesa pair of fixed spaced apart hou'sings13 andt14having the usual windows into truding frorn the housings 13 and 14, these rollsi being shown in 'FIGUREZ in their retracted inoperative positions. The rolls are equipped with the customary bearing chock assemblies particular reference being made only to .the assemblies 20 of thehorizontal rolls 16 and 17 and i in which connection the rolls and bearing chocks, as heretofore, are sometimes hereinafter referred to simply as roll assemblies.

at their lower corners, whereas the chocks20' ofthe'roll As shown in FIGURES G and. 9 the chocks 20 of the roll 16 have bearing lined surfaces21 17 are provided with central bearing lined portions 22, p

the purposes of which willbe explained later. As shown particularly in FIGURE 2, the horizontalro1ls16 and 17 are vertically adjusted through the agency of two pairsv of screws 23.; 7 V Inthe particular design'of the mill illustrated, the rolls 16 and 17 are supported by horizontally extending'bearns 25 and 26,.respectively, which in turn,.are carried by and move with the pairs of screws 23 and, thus, they can be brought to the predetermined separated roll changing position shown in FIGURE 2. As shown'in FIGURE '5, the upper beam 25 is provided with two horizontal projecbearing liners.

. As best shown in FIGURE 6, the lower beam,' since" it does not carry the Weight of the roll assembly 17, but i simply supports its weight, is provided with a bearing 1 lined central portion .27 which engages the bearing liner the operating'side. of the mill (i.e.,the right side as one views FIGURES 1 and 2) are provided with thrustbear ing assemblies 28, in which connection with reference to v the upper roll 16,projecting from the bearing assembly is a pair of rigid hooks 29, b'est shown in FIGURE 2. f A hook 29 is also provided for the lower roll 17,butin this case it is not formed on the thrust'bearing asse'mbly as in the case of the upper roll 16, but instead is'made as'an'integral part of the operator side chock 29 as can be' observed in again referring to FIGURE 2.

V The edger mill With respect to" the construction of the edger mill 12, and in reference to FIGURES '3 and 4, this mill is 'gen- 1 erally similar to the'construction of the universalmill 11 and for which reason no comment will be made'of'cer; tain components thereof.

There is one noticeable difference between the two mills, that being the. omissionin the edger mill of any vertical rolls. The rolls31 and 32 'of the edger mill'by their chocks 33 engage horizontally arranged beams 34 and 35, respectively. The front-lower lchock 33 has a hook 33b formed as an integralpart of the chock. In the particular construction'of the mill shown, the upper beam 34 doesvnot carry the weight of the top roll nor guide duringroll changing-but only receivesthe rolling loads thereof; whereas, the lower beam 35 functions in a manner similar to the lower beam -26-of the universal mill... The pair of screws 36-of the ed'ger' mill are adjusted to separate the rolls 31 and 32 toa predetermined roll changing positionat which time stools 37 i are interposed between each ofthe chocks 33 of therolls, thus serving 'to stabilize the roll assemblies and permit them tobe withdrawn and inserted into the mill in pairs.

mills ll and 12 will better facilitatean understanding of With reference. 1

the. illustrated roll changing apparatus. again to the drawings, the apparatus 'illustratedfor. changing-theupper roll ,16:of the universal millkll will be i referred to first. -As shown particularly in FIGURES, 1 i a and; 2, spaced awayfrom the ';operating side Ufgtho mill is a track 40- arranged to run ina'direction perpendicue lar toa plane containing the 'axes of the. rolls-16 and 17 This. track'40 is elevated. relative to the base jof th'e' mill 11 so that its upper surface will fall in substantiallylthe same elevation as thetop surface of the wind'21 which contains the vertical roll 19, Immediately adjacent the; :mill'a'nd'at thesarne elevation as the track 40, there is ar- 1 'ranged a second track41 but in this case it-terminates on eitherside of the wing 21. An extension track 142, shown only on FIGURE "2, is mounted on and extends across the wing'21, thus providing'fa continuous'running surface j for the track 41.

,. As shown in FIGURE4, the tracks 40mm 41 extend it I substantial distance away from the operating side, of the i mill, the. purpose of which will beeXplainedlaten The tracks are provided withsubstructures "43 for supporting g j a rig 44 to be now explained-.. This rig, as shown in FIG I 'URES 2 and'4, h'astwo pairs of wheels 45. that ru nover'g the tracks 40 and "41, one pair of which is driven by a- 'rnoto r-gear unit/36 and by iwhich"means the rig is ad'svanced longitudinally relativet o the mill.- The two ex- 'treme positions of the rig are controlled by stops 142a which are secured to the ends of theltracks -40I'and 411} V 'For determining the proper position of the rigfo'rthe 5 roll inserting phase of the roll changing operation, re-

tractable stops or the like, not shown may be employed.

As best illustrated in FIGURE 7, the rig 44 is provided with three parallely arranged spaced-apart supporting members 47 which extend in adirection parallel to a plane containing the axis of the roll'16. These'members are provided with horizontal projecting portions 8, the cen-.

ter one having two such portions. Thesemembers guide" and support two independently operative carriages 49 and 5% the middle member 47 serving as a common support for each carriage, and in which connection the carriages have lined bearing recesse for cooperating with the 'projecting portions 43 of the members. It will be appreciated that the elevation of the members 47 and, particularly,

the upper surfaces thereof are such that as the roll as.- sembly 16 is retracted and inserted into the mill, the bearing liner 21 shown in FIGURE 9 of the check .20 will slide onto the portions 48 of the members 47.

In the drawings a new roll assembly 16a, 20a and" 29a is shown resting in the carriage 49. Each of the carriages is advanced axially of the roll 16 by a motor-gear unit 51 including pinions 51a that mesh with racks 52 se-.

cured to the rig 44. The racks and pinions are shownrbest in FIGURE 7. To the front of the carriages, books 53 are pivotally secured which cooperate with hooks 29 'or.

29a formed on the thrust bearing assemblies 23 of the roll assemblies 16 or 16a. The hooks 53 also have pushing surfaces, thereby enabling the carriages to be used to insert the rolls into the mill as well as retract them therefrom.

In now referring to that part of the apparatus employed to change the lower roll 17, as shown in FIGURE 2, a second pair of tracks 54 is provided which is engaged by two pairs of wheels 55 belonging to a rig 56. This rig is constructed to handle tworoll assemblies and for tins purpose two platforms 57 and Silt-formed by central supporting bearing-lined members are provided to guide and support the checks 2!) ofthe roll 17 as it is moved along the members. 'lt'will be noted incomparingFlGURES 4 and 6 that the platforms 57 and 53 are similar to the central bearing-lined portion 27 eithe beam 26 and are engaged by a portion of the bearing liners 22 of the checks 2% of the roll 17. In the drawings, a new roll assembly 17:; and Zila is shown resting on the platform 58. The rig 56 is advanced to position one. or the other of the'platforms 57 and 58 relative to mill 11 by means of a piston cylinder assembly 60. The roll assemblies are inserted into the mill and removed therefrom by a piston cylinder assembly 61 which is provided with an extending rod 62. The outboard end of the rod 62 is connected to a'hook, assembly 63, the pivotal hook of which cooperates with the hook 29 provided on the front chock 26 of the lower 7 roll assembly 17. p Y 7 As best shown in FIGURE 2, oil-either side of the rig 55 and on the one side extending between the mill and the rig 56, stationa'ry platforms 64 and 65 are provided.

. The platform 64, in addition to serving to support the chocks 2%), also serves to guide the outboard end of the head of the piston cylinder assembly 6L This object is obtained as best shown in FIGURE 8, by providing two spaced-apart members 66 which support and guidethe hook assembly 63. These members 66 are also engaged by a portion of the liners 22 of the checks 29 The platform 65 is made long enough to permit the hook 63 to be retracted clear of the rig 56 be advanced relative to the mill.

R011 changing rig for the d eimill To facilitate the changing of the rolls 31 and 32 of the edger mill 12, and in reference to FIGURES 1, 3 and 4, the tracks 54 are extended and run slightlypa st the mill 12. These tracks support a second rig 67 having two pairs of wheels 68. a This rig 67 is provided with two platforms 69 and 70 made. up of members 71 (shown only in FIGURE I) for guiding and supporting the pairs of roll assemblies. Intlie drawings a pair Of'new roll so that the latter may assemblies 310, 32a, 33:; and 37 i are shown resting on the platform 9. Since the location of the lower beam 35 of the edger mill 12 is higher in elevation than the lower beam 26 of the universal mill-11, the platforms 5 69 and 70 of the rig 67 are built up so that their surfaces V will line up approximately with the chock-supporting sur- 7 '1 faces of the beam 35. A'piston cylinder assembly 71 is "provided for retracting from and inserting into the mill the edger roll assemblies.

1 rod 71a of the piston cylinder assembly 71 has secured to it a hook assembly 72 which includes a pivotally mounted hook for engaging a hook 331; formed on the chock 33 of the lower roll "32. The book 72 is adapted to be retracted clear of the rig 67; where it will rest on a platform 73 during which position the rig can'be moved 74 is provided for the same purpose for which platform 64 is provided in connection with the rig 56. As'shown 'inFIGURE- l, the rig 67 is connected'to the rig 56 by a connecting member 75 so that these rigs will move in uni: son and the roll changing operation of both mills 11 and 12 will be performed simultaneously. Stops 76 and 77 are arranged to automatically position the rigs '56 and 67 in the two operative positions.

Description of roll changing operation Prior to discontinuing operation of the universal mill 11 and edger. mill 12, the new roll assemblies 16a, 17a, 31a and 32a will be placed upon the respective rigs 44, 56 and 67. In the case of the upper'roll for the universal mill 11, the new'roll assembly 16a will be placed on the carriage 49 when the carriage is inits retracted position away from the operating side of themlll sothatthis opertion-will notfldisturb the operation of the mill. .In the .case of the lower roll assemblies for the universal mill 11 ,for the universal mill and thenewlpair of rolls 31a and 321i for-the edging mill, no operation of the cylinder t will be necessary, these rolls being placed on the plat -fo1'ms 58 and 69 when they are positioned at one side of V 55. the millso that the unoccupied platforms 57 and of the rigs 56 and '67 are lined up relative to the mill.

7 Once the roll changing procedure has advanced to this state, the carriage StJ is advanced towards the mill by the operation of the'motor-gear unit51, the piston cylin- 60. der assemblies 61 and 71 being also operated. It is to be understood that as a prelude to changing the rolls, the rolls in both mills 11 and 12 will be separated'by the operation'of screws 23, 36 so that therolls of each mill will assume a predetermined vertical position. Also with riage Stl will engage the hook 29' of the upper roll 16, the hook 63 of the rig 56, the hooks 29 of the lower roll 17 70 and the book 72 of the rig 67,' the hook 33b of the 'lower v"1131132. l u y Assuming thatall the necessary stepshave taken'place to permit the withdrawal of the rolls, then the motor-gear unit'Sl and the piston cylinder assemblies 61 and '71 are" again operated to withdraw the rolls: from the mills 11 In this respect the construction m is similar to the mechanism provided for the lower roll- 17 of'the' universal mill 11. Accordingly,.the extended longitudinally relative to the mill; A stationary platform and the edgenmill 12, the new rolls 17q,'31a"and 32d, l

where it will *be noted that the new roll is positioned at. one-sideof the mill and the carriage 50 is lined up rein- 50 tive' to the mill. With respect to' the new lower roll 17a 7 65, respect tothe edger mill, thestools 37 must be inserted between the checks 33. as shown in 'FIGURE 4. In the vertical predetermined position'the book 53 of the carand'12. In the case of the upper roll 16 of the universal mill 11, the beam will assist in guiding and supporting the roll assembly-until its rearward chock 20 comes into engagement with the supporting surfaces 48 of the rig 44. Since the chock-supporting surfaces of the rig are in the.

proper elevational position relative to the beam, the re- 7 traction of the roll assembly will be one continuous move-j menta With respect to the lower roll assembly 17"of this mill, it will be initially supported and guidedby the beam 26 and will pass over the members 66 of the stationary platform 64 and eventually come to rest on the platform 57,0f therig 56. Once this occurs the piston. cylinder assembly. 61 will be retracted so that its book 63 willbe positioned upon the stationary platform 65 thereby a1- lowing free movement of the rig 56 in a directionjparallel to the steel line of the mills. r e

As to the rolls 31 and 32 of the edger mill 12, once the lower roll 32 has been engaged'by the-hook 33b which'is connected to the rod 71a of thelpiston cylinder assembly '71, the'assembly. will be operated to retractthe rolls over the stationary-platform 74 and come to rest on the platform 70 of the rig 67 After the hook 33b is disengaged from the roll assembly, it will be further retracted to a a to permit the rig 67 ing the motor-gear unit 46which will move the rig 44.

to the proper position. In the case of the lower'roll for the universal milland the two rolls for the edger' mill, the operation of the piston cylinder; assembly 60 will remove the Worn rolls and "automatically position the new rolls in the proper' position .relative .to. the front'of the mills 11 and 12 It'will be noted inFIG- URE 4 that upon the movement of the carriage 50, there -will be no interference between this carriage and the .wornset of rolls 31 and 32 which 'havebeen removed .from the edger mill 12. Once the replacement rolls'have .thus been positioned, themeans employed forretracting the roll assemblies will be operated to automaticallyin- After this has taken place "sert the rolls. into .the mills.

the rig 44 can be 'retra'ctedto its inoperative position permitting the mill 11 to 'beputback into operation along .;with the mill 12. Theworn'rolls can be removed-:after the millhas resumed production and atthe'convenience of the operators. As mentioned previously, once ctlie' worn rolls have beenremoved from'the rigsiifiand' 67, the. floor plates may be inst'alledabove these rigs Itwillbe appreciated from'theabove' that the. ap-

paratus illustrated to explain the presentinvention will accomplish'each and every one oftheobjects'. earlier set forth, it being particularly noted that not'only is the 'roll changing time for the mills .conside rably'reduced from what waspreviously experienced, but that the servic'e'ofafcrane or cranes is notrequired duringthe actual roll changing'operation; Moreover, in view of the-fact that the rolls may be brought to the mill prior to the discontinuance of operation,- considerable additional time may be saved, in addition to the fact that the roll cihanging operation afterthisrpoint neednotbe made contingent upon the availabilityofa crane,

:' In accordance .'with the provisions of the patent statutes, we haveexplaiued the principlerand operation of our, invention and have illustrated and described what we consider to represent the best embodiment ther'eof. However, we desire to have it understood.that withihjthe .scope of the appended claims, "theiinvention may be' practiced otherwise than as specifically illustrated and described.

Weclaimz 1. In'combination' with a rolling mill havingat least.

two rolls in which said rolls are arranged substantially in a common vertical plane, 7 I a roll changing apparatus'comprising av first rig having a first supporting area for receiving a roll with-. r

drawn from theinill and a second area for supporting a replacer'nentroll to be inserted into said mill, a r V V a substructure supporting said first rig at :aneleva- "tion .substantiallycoincident with at least a portion of the upper-most roll, said ;fi rst rig being arranged so that its first relative to the upper-most roll of said mill, a second, rig .having' a first supporting area for receiving a roll withdrawn from the mill andra second area for. supporting a replacement roll to be inserted. into the mill,

:said second rig being arranged to pass beneath therfirst rig at'an elevation'substantia-lly coincident with at least a portion of the lower-most roll, said'second rig being varranged 'so that its. first and second supporting areas can be brought into their. receiving and inserting positions, respectively, rela- 'tive to'the lower-most roll ofsaid mill, and means for moving said rigsrlongitudinally relative to said mill to locate said first roll-supporting areas in positions to receive rolls withdrawn from the 'mill and for further moving said rigs so that the withdrawn rolls will be removed away from said receiving. positions and the replacement rolls sup. ported by said second roll-supporting areas. posi-I tioned relative thereto in readiness for insertion into the mill. V r J 2. A roll changing apparatus according tofclaim 11 wherein said substructure is arranged so that the first rigcan be brought to a roll storage position away from the 'roll receiving position of said mill.

3.A roll changing apparatus according to claim 1.

wherein said area of said second rig for supporting-a replacement roll can be brought 'to' a roll storage position:

away from the roll receiving position'of themill. V 4. A roll changing apparatus according to claim: 1 in which saidmill includes a horizontal projection extending in a direction of a plane containing the axes of the rolls, V said projection constituting a portion of said substructure and serving to support said first rig during at least a portion of its longitudinal movement relative to said mill;

i 5.A'roll changing apparatus according to claim l including a pair of carriages supported'by said firstand.

second roll-'supporting'areas of said first rig,

means for advancing said carriages in a direction to withdraw from and insert rolls into the mill.

6. In combinationjwith a rolling millha'vinga'fixed 'housing, includirig at least two roll assemblies in which said rolls are arranged with their axes in a common vertijcalplane, j f e 'meansffor adjustingrsaid upper'roll relative to said lower roll, 7

drive means arranged on one side of said'mill for driv-.

ing atleast one of saidrolls,

said mill further including meansextending axially for i supporting the upper rollassembly'during its passage when the 1 through and relative to said fixed housing 7 upper roll assembly is being changed,

adjusted by the roll adjusting means, I

said millincluding a second means for supporting said upper roll' assembly having. a portion'overhanging I and sec-1 0nd supporting areas can be brought intoan opera tive receiving and inserting position, respectively,

said means 'for supportingsaid upper roll assembly" movable therewith whensaid upper roll assemblyis the outer end thereof whenthe upper roll assembly is in its operative position in the mill,

said second supporting means extending from the side of said mill opposite the side on'which said drive means is located, a

a roll changing apparatus comprising a rig having a first supporting area for receiving said upper roll assembly withdrawn from the mill and a second area for supporting a replacement roll assembly to be inserted into the mill, i

said rig being arranged so that said first and second supporting areas thereof can be brought into their receiving and inserting positions, respectively, relative to the mill and at such an elevation that in the withdrawal and insertion of said upper roll assembly, the upper roll assembly will be continuously supported alternately by the said first and second supporting means of the mill and by one of the supporting areas of the rig, and

means for longitudinally moving said rig relative to said mill to locate one of its roll-supporting areas in position to receive an upper roll assembly Withdrawn from the mill and for further moving said rig so that the withdrawn upper roll assembly will be removed away from the said receiving position and the replacement roll' assembly supported by said second supporting area of said rig positioned relative thereto in readiness for insertion into the mill.

References Cited by the Examiner UNITED STATES PATENTS 661,470 11/00 Fawell et al. 80--1.3 749,745 1/04 Philp 80--1.3 1,935,091 7/32 Iverson 801.3

FOREIGN PATENTS 1,251,984 12/60 France.

0 CHARLES WQILANHAM, Primary Examiner. 

1. IN COMBINATION WITH A ROLLING MILL HAVING AT LEAST TWO ROLLS IN WHICH SAID ROLLS ARE ARRANGED SUBSTANTIALLY IN A COMMON VERTICAL PLANE, A ROLL CHANGING APPARATUS COMPRISING A FIRST RIG HAVING A FIRST SUPPORTING AREA FOR RECEIVING A ROLL WITHDRAWN FROM THE MILL AND A SECOND AREA FOR SUPPORTING A REPLACEMENT ROLL TO BE INSERTED INTO SAID MILL, A SUBSTRUCTURE SUPPORTING SAID FIRST RIG AT AN ELEVATION SUBSTANTIALLY COINCIDENT WITH AT LEAST A PORTION OF THE UPPER-MOST ROLL, SAID FIRST RIG BEING ARRANGED SO THAT ITS FIRST AND SECOND SUPPORTING AREA CAN BE BROUGHT INTO AN OPERATIVE RECEIVING AND INSERTING POSITION, RESPECTIVELY, RELATIVE TO THE UPPER-MOST ROLL OF SAID MILL, A SECOND RIG HAVING A FIRST SUPPORTING AREA FOR RECEIVING A ROLL WITHDRAWN FROM THE MILL AND A SECOND AREA FOR SUPPORTING A REPLACEMENT ROLL TO BE INSERTED INTO THE MILL, SAID SECOND RIG BEING ARRANGED TO PASS BENEATH THE FIRST RIG AT AN ELEVATION SUBSTANTIALLY COINCIDENT WITH AT LEAST A PORTION OF THE LOWER-MOST ROLL, SAID SECOND RIG BEING ARRANGED SO THAT ITS FIRST AND SECOND SUPPORTING AREAS CAN BE BROUGHT INTO THEIR 